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Old 08-11-2011, 06:40 PM
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Default isobaric enclosure?

Has anyone done one of these before?

What are it's advantages other than low distortion and half vas?

Does it need more power to run? Is it more prone to destroying my subs?

This setup will be for 2 x Reconed DC LVL4's wired down to .5 ohm load @ roughly 3000 RMS


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Old 08-11-2011, 06:54 PM
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Haven't done one but if I'm not mistaken the diagram you linked isnt the correct phase. Those subs in that configuration should be wired in phase with one another
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Old 08-11-2011, 06:55 PM
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Maybe I'm just looking to closely but wouldn't subs hit at the same time, same direction. In the picture they're moving in opposite directions.
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Old 08-11-2011, 07:14 PM
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built a bunch back in the days. they are lowend monsters but dont like alot of power. its a push pull design. you have to wire one out of phase if its inverted and keep the airspace between the 2 to a minimum
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Old 08-11-2011, 08:13 PM
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I don't really think there is too much of an advantage to them. You can theoretically use like half the box size but I don't think it's that great.
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Old 08-11-2011, 08:14 PM
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I looked up isobaric enclosures for fun and they sound pretty cool, but it seems like a lot of work for SQ. Also like hackmunch said they don't like too much power.

How would install you subs facing each other, wouldn't the surrounds touch? An obvious answer to me would be to have two walls very close together with the subs mounted on, but then you would have another volume of sealed air
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Old 08-11-2011, 08:22 PM
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They must be opposite phase because this is how one emulates a larger/smaller airspace for the other i think.

in phase would be a normal enclosure with two subs.

I have never done one but i doubt they are worth a crud. Just think of how tough if at all possible it would be to get perfect 180 degree phasing with them. And they are supposed to be as efficienct as one in twice the volume.

I'm not exact on my info though..
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Old 08-11-2011, 11:01 PM
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makes sense.. if they are running in phase, the box would have to be for 2 subs... push-pull and you can have in theory half the size of the enclosure for 1 sub...

mhmm.. If made to the enclosure size of 100% for 1 sub vs 50%, would there be much diffence??

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Old 08-11-2011, 11:05 PM
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Why would it be hard to set the phase? Wouldn't you just need two separate amps for the subs and set one to the full 180 and one at 0
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Old 08-11-2011, 11:14 PM
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Yeah, that's a push/pull in your diagram. Not iso.

I've fooled around with a few. They sound great and the boxes are friggin tiny. Nobody does them anymore because of the insane power handling of subs now-a-days. The two subs being out of phase cancel out the odd (or even) ordered harmonic irregularities. That's why it's a popular design for SQ. But they can get loud as shit. Linear Power Blues makes a iso pair as a set you can buy with a kick ass little plexi tube between the two drivers. That setup is like $1k though. Yikes.
Really, the only disadvantage of an isobaric design is that it's a theoretical -3db of the same two subs in a conventional enclosure. Which just means that an iso pair is as loud as a single sub in a conventional. But the fact that you can stuff a pair of 12's in 1 cube and wang the piss out of it and still keep conventional tuning is freaking awesome. Lol.
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